Jason Burke

TL;DR: A review of the current status of the surrogate approach can be found in this paper, where experimental techniques employed and theoretical descriptions of the reaction mechanisms involved are presented and representative cross section measurements are discussed.

Abstract: We have deduced the cross section for $^{237}\mathrm{U}$($n,f$) over an equivalent neutron energy range from 0 to 20 MeV using the surrogate ratio method. A 55 MeV $^{4}\mathrm{He}$ beam from the 88 inch cyclotron at Lawrence Berkeley National Laboratory was used to induce fission in the following reactions: $^{238}\mathrm{U}$$(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}}f)$ and $^{236}\mathrm{U}$$(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}}f)$. The $^{238}\mathrm{U}$ reaction was a surrogate for $^{237}\mathrm{U}$$(n,f)$, and the $^{236}\mathrm{U}$ reaction was used as a surrogate for $^{235}\mathrm{U}$$(n,f)$. Scattered \ensuremath{\alpha} particles were detected in a fully depleted segmented silicon telescope array over an angle range of ${35}^{\ifmmode^\circ\else\textdegree\fi{}}$ to ${60}^{\ifmmode^\circ\else\textdegree\fi{}}$ with respect to the beam axis. The fission fragments were detected in a third independent silicon detector located at backward angles between ${106}^{\ifmmode^\circ\else\textdegree\fi{}}$ and ${131}^{\ifmmode^\circ\else\textdegree\fi{}}$.

TL;DR: In this article, the decay probability of the same compound nucleus produced using a stable beam on a stable target to estimate the neutron-induced reaction cross section was measured using the surrogate method.

TL;DR: In this paper, the lifetime of the even-even closed shell nuclei was measured to be 11.7(20) ps corresponding to a value of 4.15(73) W.u.

TL;DR: A new method for determining cross sections for neutron capture on unstable isotopes, using ^{87}Y(n,γ) as a prototype, is demonstrated, which can be generalized to a larger class of nuclear reactions.